Question : Outlook - Display Format Problem

I've been working on this for a few days and am now finally so stumped I have to ask here.

My parent company resides in Singapore.  They have an Exchange 2007 server and their clients use Outlook 2003 from what I'm aware of.  I have no control over their systems or clients, but can easily request them to help me out if required.

I have an odd setup.  I have a Linux/Postfix/Courier-POP3 setup for most of the users.  I am testing Exchange 2007.  So my account is on an Exchange server.  The president has his account hosted on a third party Exchange server so he can sync with his Blackberry properly (yes, I know; just giving info, please don't blast me on how stupid this sounds).  For mine, I use the transport rule and instantly relays my email to the test Exchange server; for the president, his is setup as an alias to the hosted email address.

When I receive emails from my parent company, there are three receipients for example, A, B, and C.  I am A (Outlook 2007), the president is B (Outlook 2003), and my boss is C (Outlook 2003).  These emails have embedded images in them.  When A and B receive them, they show as HTML format and show the images.  User C receives the exact same message and it shows as plain text and just shows one of those '[cid:asfasf@adfasf]' type internal links.

I have already checked user C and the open to display emails as plain text only is not checked.  I have read that removing a registry key 'KEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security\OutlookSecureTempFolder' and/or deleting the contents of the specified folder; didn't work.  I setup a POP3 account on my Outlook 2007 client and delivered the email to the mailbox that resides on the Exchange server.  I delivered the EXACT same email that displays properly if it is delivered to Exchange and it displays as plain text.

Also, when looking at the raw email sent via SMTP on my barracuda (which scans, then delivers to the Postfix server), a winmail.dat attachment is there, but since all the clients are Outlook I'm not seeing that as an issue.

I am just at a loss.  If delivered thru Exchange, fine; if delivered thru POP3, not fine.  Just trying to figure out what I can look at next.  I'm having the IT guy over in Singapore check his settings to ensure he's sending as HTML and not Rich Text or Plain Text.

Answer : Outlook - Display Format Problem

Ok, finally able to reproduce issue on demand.  It seems as though the Singapore server (haven't confirmed yet; only tested with my local Exch server) have set my users up as mail contacts.  They have also set us up to receive (or atleast some of us) as mapi rich text format.  On my server when I set it to default settings, the server converted it to html.  When I forced it to do mapi rtf for the contact then it didn't convert it and I saw the same symptoms I am trying to fix.

My questions:  Where in Exch 2007 do to view/set the default MAPI RTF settings?  I'm only finding it for per-contact.